<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <meta http-equiv="X-UA-Compatible" content="ie=edge">
  <title>Document</title>
  <style>
    html{
		height: 100%;
	}
	body{
		min-height: 100%;
		display: grid;
		grid-template-rows: 1fr 50px;
	}

  .content{
    background-color: red;
  }

	.footer{
    background-color: pink;
	}
  </style>
</head>
<body>
  <div class="content"></div>
  <div class="footer">
    something
  </div>
</body>
</html>